Method and apparatus for making headed machine parts



Patented July M, 1922o cere-N trice;

DAVID EMANUEL JOHNSON AND THORVALD AUGUST MADSEN, OF ROCKFORD, -IlJllLI-v NOIS, ASSIGNORS TO NATIONAL LOCK COMPANY, OFROCKJFOB,D,' ILLINOIS, ACOR- TORATION 0F ILLINOIS.

METHOD AND APPARATUS FOR MAKING `HEADEI) MACHINE PARTS.

To all whom it may concern:

Be it known that we, DAVID EMANUEL JOHNSON and THORVALD AUGUST M ADSEN,citizens of the United States, residing at Rockford, in the countyv ofWinnebago and State of Illinois, have invented certam new and usefulImprovements in Methods and Apparatus for Making Headed Machine Parts,of which the following is a specification.

Our invention relates to the lmanufacture of machine parts and morespecifically to the manufacture of bolts,v screws and the like, theheads of which are formed by upsettingthe ends ofy the pieces of plainstock from `which the parts are made.

An object of our invention is to finish thehead of the vboltin a singlemachine.

Furtherl objects and advantages of our invention will become apparent asthe description proceeds.

In the accompanying drawings Figure 1 is I a plan view illustrating asmuch as is necessary of a bolt heading machine. Figs. 2 and 3 arevertical sections through the center of the dies indicating the twosteps or stages of the process, and Fig.`4 is aview of Aa special typeof head. l

In. the embodiment of our invention selected for illustration, a mainframe 10 carries a horizontally slidable ram 11 in which the punch block1.2 is mounted for vertical sliding motion in suitable guides. A bar 13of stock is periodically advanced to protrude its end the properdistance from the die block 14 and cut off by a transversely movingcutter 15 having fingers 16 which grip the cut-0H portion,and carry itacross to a position in front of the die. As soon as the first punch 17has advancedfar enough to i start the cut-olf pieceinto the hole 18 inthe die 19,` the fingers'l are withdrawn. A

vknock-out rod 20 is seated in the hole 18 in the die 19 and limits theentry of the bolt 21l so that the first punch can upset the projectingportionto vtorm a head 22. After the first punch has perated, and upsetthe protruding stock, aosecond punch advancesand forms the head\complete, after which -a knock-out lever 24 is automatically actuatedto move the knock-out rod )forward Vand eject the finished bolt. Theposition of rest of the knock-out lever 24 determines the limitingposition of the rod 20 and may be adySpecification of Letters Patent.A llPafdymltt.d July 1ML, 19225 Application mea July s,

1920. Serial No. 394,671.

justed by suitable means such, for instance, as an adjustable setscrewv25 suitably mounted 1n a stationary part of the machine.

The above described parts and operations in and of themselves are oldand well known in the art and form no part of our present lnvention. l

As illustrated in Fig. 2, the operation of the punch 17-to form the head-22 leaves a iin 26 around the upper portion of the head. It hasheretofore been customary to deliver the bolt in this condition fromthe`heading machine and subsequently to remove the fin by passing thebolts through a shaving die in another machine.

According to our invention, after the formation of the head, as `shownin Fig. 2, the punches are retracted 'and the knock-out rod 2O `isautomatically advanced as indicated in Fig. 3 so that the fin 26 isseparated from the die 14. The advance of the second punch 23 will thenshave and clean the sides of the head 22 and strip the fin 26 from theupper edges ofthe head. When the punches are retracted the second time,the knock-out lever is actuatedto deliver a completely finished boltfrom the machine.

Any suitable means for advancing the knock-out rod 20 between the stepillustrated in Fig. 2 and the step illustrated in Fig. 3 mav. beemployed. We have shown a spacer ro 27 interposed between the knock-outlever 24 and the adjusting set screw 25. ThisI spacer rod has a narrowend' portion followed by a thicker portion, and immediately upon thecompletion of the formation of the head, as in Fig. 2, it is displacedlongitudinally to the position shown .in Fig.

3, shifting the knock-out lever 24 slightly and protruding the bolt. l

The bolt we have illustrated in Fig. 4 is a blank for a squarehead ovaltop set screw. The blank is to be pointed and threaded before it isafinished set screw. In forming such a part the squared head 22 is formedinthe die which is shaped for this purpose. The oval shaped top of thehead is formed by the first punch. This punch does not advancev close tothe face of the die, but leaves a small opening between the faces of thepunch and the die, so as to permit the surplus material to flow outlaterally. This leaves a fiash or fin, which is shaved 0H by the secondpunch as shown in Fig. v3.

The completion of the bolt head in one machine has several advantages.It simpli-` fies the machinery employed. It makes-it possible toautomatically finish in one m'achine, a large number of shapes thatWould be diiiicult to automatically feed into another machine, forexample, Where the diameter of the body and the head across the flat areapproximately the same, or Where the length of the body under the headis very short in proportion to the height of the head. Another advantageis that Where bolts have irregularshaped heads, it is very difficult to`automatically transfer these into another machine so that the shape ofthe head registers correctly With the shaving'die.

While We havegshown and described our inventionappliedto a double strokeheading machine, using the first blow for upsetting or making the head,and the second for shaving the head, it should be understood that amachine designed to make three or more strokes can be employed. It willbe evident to anyon,f e..v.;skilled in the art, that only a limited-amount of stock can be forced into the head in one blow, and for thisreason, on bolts having large heads two or more blows Will be necessaryfor producing the head. Also, on Work Where a very fine finish isnecessary, two shaving punches may be employed. Many other modificationsand variations will naturally occur to those skilled in the art and theaccompanying disclosure should therefore be considered as illustrativeonly. We aim in the subjoined claims to cover all legitimate variationsand modifications of the inventive idea disclosed. We claim as ourinvention:

l. The process of forming a headed member comprising the step ofsupporting a blank in a die, the step of shaping the body of the head,the step of protruding the blank from said die, and the step of shearingthe fin from the protruded blank. 2. The process of forming a nishedheaded member in a single machine comprising forming the main body ofthe head, shifting the position of the stock, and subsequently shearingthe 1in from the head.

3. A unitary mechanism for manufacturing finished headed memberscomprising means for forming the body of the head, means for shearingthe fin from the head, and means for ejecting the finished article.

4. A unitary machine having, in combination, a die, a pair of' movablepunches, means for supporting a piece of stock in said die in alinementwith one of said punches,

means for advancing one of said punches to.

shape the end of the piece of stock, means for shifting said punches toposition the other punch in alinement with said stock and for protrudingsaid stock from the die, means foradvancing the second punch to shearoff the fin formed by the first punch, and means for ejecting thefinished heade article.

In testimony whereof We have hereunto set our hands.

DAVID EMANUEL JOHNSON. THORVALD AUGUST MADSEN.

